JPS5849211A - Method of lining pipe line having branch - Google Patents

Abstract

PURPOSE:To prevent a junction and a branch from being clogged, by sticking a lining material on the inner wall surface of a main pipe with the junction of the branch stuffed with a plug, and heating the plug to melt or decompose the adhesive and the lining material at the junction so as to make an opening there. CONSTITUTION:When the lining material is stuck on the inner wall surface of the main pipe 1 having the branch 2, after the plug 3 is inserted from the tip of the branch 2 to the junction of the branch 2 to close the junction, the soft and cylindrical lining material 10 that is coated with an adhesive is reversed and inserted by fluid pressure into the main pipe 1 and is stuck to the inner wall thereof, and the plug 3 is heated, so that the adhesive and the lining material 10 at the junction are melted or decomposed to make an opening there thereby the branch 1 becomes in positive communication with the main pipe. As the plug 3, a plug is preferred that has an electrical heater 4 at the center which is covered with a resilient thermoplastic resin 5 such as a polyurethane resin, a soft polyvinyl chloride, etc.

Description

[Detailed description of the invention] Pipes buried underground such as gas pipes and water pipes!
The present invention relates to a method of lining pipes for repairing or reinforcing pipes, and particularly provides a method for lining pipes having a large number of branch pipes.

Generally, as a method of burying the pipe underground and then lining the pipe, an adhesive (usually a reaction-curing adhesive is used) is applied to the inner surface of the flexible cylindrical lining material. Then, one part of the lining material 9 is fixedly supported in an annular shape, and fluid pressure is applied to the rear part of the annular fixed part, so that the inside part of the lining material r becomes the outside part at the folded part formed there. While turning it over so that it is inside out, the folded part is advanced into the consonant path, and the lining material is inserted into the conduit and the fluid pressure is applied at the same time. In this method, which is known as a method of press-bonding the inner surface of the pipe through the adhesive and solidifying the adhesive, there is no need to excavate the entire length of the pipe. This method has attracted particular attention in recent years because of its many advantages, such as the fact that it can be added only by raising a moat 9 at both ends of a predetermined section, and the construction work can be completed in a short period of time.

However, with this method, after the entire pipe is lined, the lining material covers the entire circular surface of the pipe, and when a branch pipe is attached to the core pipe, the branch pipe is blocked. For example, in gas pipelines, there are almost no high-pressure pipes or medium-pressure pipes at the branch ends, but many supply pipes branch off from the low-pressure pipes at the ends to supply gas to each household. . Therefore, if these supply pipes are blocked, the gas supply to each household will be interrupted, which is inconvenient. Lining 1
7k It is possible to drill and drill the branch part after LrC, but if the branch part was drilled for each supply pipe, it would not be much different from drilling the branch part over the entire length. The greatest advantage of the lining method will be lost.

Also, is there lining material on the pipes? For example, the method disclosed in Japanese Patent Application Laid-Open No. 55-41274 is known as a method for drilling holes in the lining material at the branch point without raising the conduit trench 9 after pasting. However, when attaching lining material to a pipe, internal pressure is applied to the lining material, so if the adhesive is used for the entire adhesive layer, a portion of the adhesive will flow into the branch pipe and close to the branch point of the branch pipe. The sections are often filled with several centimeters of cured adhesive, making it extremely difficult to drill through this thick layer of adhesive.

Non-invention is something that was not done in view of the circumstances,
Tie a ligature at the branch point of the branch pipe and attach a lining material to the pipe with the closed position to prevent the adhesive from flowing into the branch pipe, and then heat the plug to prevent it from entering. The lining material and adhesive at the branch point are melted or decomposed to form a hole to connect one branch pipe and the conduit.

The present invention will be explained below with reference to the drawings. FIG.
This is a conduit, and two branch pipes are branched from the conduit 1.

Since the branch pipe is usually used to supply gas or tap water into a house, it usually rises above the ground in the middle of the pipe, so the nine parts of the rising part are removed and the tip of the branch pipe 2 is opened. Then, the plug 8 is inserted into the γ branch pipe 2 from the opening direction. This stopper 8μ@2 is as shown in Figure 2, and has an electric heater 4 in its center.
The surrounding area is covered with a thermoplastic synthetic resin 6 having elasticity such as polyurethane resin, soft polyvinyl chloride resin, etc., and has a weight of 7 t%. Further, 6 is an IT line for energizing the electric heater.

Oh my god, this spigot has three branches! f2θ After inserting from the tip, put a lid on the branch tube 2? Purple cover. This good 7 includes the above '
A through hole 8 and a pressurized fluid inlet 9 are provided for introducing w1,1lli16τ. This state is shown in FIG. 1(1).

Next, compression g! from the pressure fluid inlet 9! Pressure fluid like air? As the feed is introduced, the stopper 8 moves around the branch point in the branch pipe 2, and finally the stopper 8 is located at the branch point of the branch pipe in the pipe line 1, as shown in FIG. . In order to correctly position the stopper 3 at the branch point, measure the exact length r of the branch pipe in advance using an appropriate length measuring method, and
The position of the plug 8 is measured from the retracted length of the ILL string connected to the /s6 or the plug 3, and when the plug 8 is correctly located at the branch point, the entrance of the electric wire 6 or the string is stopped. All you have to do is position the plug 8r correctly at the branch point.

In addition, once the stopper 811 is advanced beyond the branch point and into the pipe line 1, then the electric wire 6 or the string r is pulled and pulled slightly into the branch pipe 2 again, so that the stopper 8 is located at all the branch points. You can also do it.

A turning point in this way? After closing with stopper 8, the
As shown in JK, line the inner surface of the pipe 1 by pasting the lining material 10 on it. At this time, the adhesive used for the lining cannot flow into the branch pipe 2 because the branch point of the branch pipe 2 is blocked. Also, some adhesive may enter between the plug 8 and the pipe wall of the branch pipe 2, but this is not a problem.

When the lining material 10 is completely adhered to the inner surface of the conduit 1, a current is applied to the electric heater 4 through the six T-wires,
cause fever. The temperature of the electric heater 4 at this time is preferably several iC, preferably about 400 to 700'C. Then, this heat melted the thermoplastic synthetic resin that was in charge of the four electric heaters, and the heat that melted inside the vehicle also melted.
] Due to the heat of the plastic synthetic resin, the lining materials 9 and 10 at the branch point and the adhesive melt or do they melt? When the n1 branch point was unraveled, a hole was created in the lining material that had been blocked. The melted thermoplastic synthetic resin, lining material, and adhesive are then dripped into the pipe 1 through the hole, and the electric heater 4 is also
It falls into the path 1 and is suspended by an electric wire 6 or string as shown in FIG. 1(a). Then, the hole at the branch point is completely perforated, and the water flows through the pipe 1 and the branch pipe 2.

The remaining electric heater 4 can be taken out from the open end of the branch pipe 2 by pulling [a6 or the string ligature.

In addition, in this method, the molten exchange thermoplastic resin, melted or decomposed lining material, and adhesive may drip into the pipe while still at high temperatures, causing burnout of the lining material 101° at the bottom of the pipe. Therefore, it is better to heat the plug 3r while water is present at the bottom of the pipe. This work 9 not only prevents damage to the bottom of the lining material, but also prevents dripping and molten resin from staining the bottom 9.
It does not stick and can be easily washed off,
Is there pressure loss because there are no unevenness on the inner surface of the pipe? It is the mind that has the effect of reducing %.

The plug 8 used in the misfire 8A is not limited to the shape shown in FIG. 2. FIG. 8 shows another example of the stopper 8, in which a wJ-shaped portion 11 having a diameter comparable to the inner diameter of the branch pipe 2 is shown.
(2) A crocodile part 127 is formed at the lower part, which is larger than the inner diameter of the single branch pipe 2 by 19. When the stopper 8 is pushed into the branch pipe 2, the flange 12 deforms as shown in FIG. When the stopper 8 goes beyond the branch point and enters the pipe 1, the elasticity of the synthetic resin 5υ causes the collar 12 to expand laterally, and the electric wire 6
When the 8 plugs are pulled into the branch pipe 2 by pulling the same number of plugs, as shown in Fig. 4 (7).
)) The flange part 12 is caught in the sea urchin to ensure that the stopper 8 is located at the branching point.
does not flow into the branch pipe 2.

Furthermore, the stopper 8 does not necessarily need to be coated with the synthetic resin 5. Even if the electric heater 4 is used alone, it is sufficiently possible, but when the branch pipe 2 is ligated using fluid pressure, pressure leakage may occur.
is large, so it is preferable to cover it with a synthetic resin having elasticity. Also, when using an electric heater (k) IL, adhesive will enter around the electric heater when lining it, but this will decompose and be removed when the electric heater generates all the heat. There is no problem.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing step 1 of the inventive method. FIG. 2 is a longitudinal sectional view showing an example of the stopper used in the present invention. FIG. 8 shows another example of the stopper;
The figure shows how the stopper is used. 1...Pipeline 1.2...Branch pipe, Death--
- Plug, 4... Electric heater, 5... Thermoplastic synthetic resin, 1o... Lining material, 11...
...Cylindrical part, 12...--Brim part. Tokuken applicant Tokyo Gas Co., Ltd.

Claims (1)

[Scope of Claims] 1. A branch pipe in a conduit is closed with a stopper at the branch point, an adhesive is applied to the inner surface, and a flexible cylindrical lining material is inserted into the conduit while being pushed back by fluid pressure. The adhesive and lining material at the branch point are melted or decomposed by inserting the lining material into the inner surface of the pipe, and then turning it inside out and adhering the lining material to the inner surface of the pipe via the adhesive. A method for lining a conduit having a branch pipe system, characterized in that the hole T is opened and the branch pipe R is connected to the pipe line. 2. Generating heat in the plug when water is present at the bottom of the pipe wlf! A method for lining a pipe line having a branch pipe r according to claim 1, wherein the feature is: i.